Thermally stable coprecipitated catalysts useful for methanation

Details Thermally stable coprecipitated catalysts useful for methanation Thermally stable coprecipitated catalysts useful for methanation

1975-10-14

1976-10-26

Shine, W. J.

Compositions

Preservative agents

Anti-oxidants or chemical change inhibitants

252463, 260449M, B01J 2104, B01J 2306, B01J 2372, B01J 2374

Patent

active

039882632

ABSTRACT:
Catalysts having a high degree of thermal stability, comprising alumina and one or more of the metals iron, cobalt, nickel, copper and zinc, are prepared from aqueous solutions containing a dissolved aluminum salt, a salt of at least one of the aforesaid metals in divalent form, and a delayed precipitant such as urea. With all components in homogeneous solution at a relatively low pH and temperature, the solution is heated to a temperature sufficient to hydrolyze the delayed precipitant with resultant liberation of ammonia and carbon dioxide homogeneously throughout the solution, until the pH of the solution rises sufficiently to effect coprecipitation of the metal salts as hydroxides and/or carbonates. The resulting coprecipitate is then recovered, washed, dried, shaped and calcined in conventional fashion to obtain a final product which is very active, and displays much greater thermal stability than corresponding prior art catalysts prepared by non-homogeneous coprecipitation with alkaline, ionic reagents such as sodium carbonate, ammonium hydroxide, or ammonium carbonate. The nickel-containing catalysts are particularly useful for methanation, but they are all useful in a variety of other reactions.

REFERENCES:
patent: 3444099 (1969-05-01), Taylor et al.
patent: 3625664 (1971-12-01), Padovani
patent: 3637529 (1972-01-01), Van Beek et al.

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